Anyone can be engaged on defence, even DeMar played good defence on Lebron at one point last year. The problem with Valancuinas is his quickness. He is way too slow to cover Kyrie, Kemba, John Wall, or Isaiah Thomas on a pick and roll. All teams do is run a simple pick and roll against JV and they end up with easier points more times than not.
As for Derozan, he has his faults highlighted in those videos. However, its not like the Sacremento Kings run offence through Matt Barnes and thats what I mean when I say that you can hide him as long as he is in the right position. With Lowry and JV they have to be above average and simply put JV is too slow to be below average.
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